Keeseville is a village in both Clinton County, New York and in Essex County, New York in the United States. The population was 1,850 at the 2000 census. The village is named after the Keese family. The Village of Keeseville is in the Town of Au Sable (or Ausable), New York and the Town of Chesterfield. Keeseville is south of Plattsburgh. It is also inside the Adirondack Park.